{"id":"CVE-2026-90157","summary":"bpf: Reject negative optlen in cgroup getsockopt hook","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject negative optlen in cgroup getsockopt hook\n\nA cgroup getsockopt BPF program can shrink ctx-\u003eoptlen after the\nkernel getsockopt handler has run. The kernel-buffer variant, used by\nTCP_ZEROCOPY_RECEIVE, only rejects values larger than the original\nlength.\n\nIf BPF writes a negative optlen, that value is accepted and propagated\nback to the TCP getsockopt code. It can then be passed to\ncopy_to_sockptr() as a size_t and trigger the hardened usercopy\nbytes \u003e INT_MAX warning.\n\nReject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),\nmatching the lower-bound validation already present in the sockptr-based\ngetsockopt hook.","modified":"2026-09-19T03:47:24.821491369Z","published":"2026-09-17T16:06:49.081Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90157.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74"},{"type":"WEB","url":"https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90157.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90157"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"08f61a34913558e06576e7b6318bf583f273c1be"},{"fixed":"5b09d984b38b018b123c3a9e02a96bbc6468dbe5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9cacf81f8161111db25f98e78a7a0e32ae142b3f"},{"fixed":"554ba7195c4108726450e24480c8449990c2268c"},{"fixed":"d02a12b4085ffe41ea750b1007f7a9c7aee2875a"},{"fixed":"e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2"},{"fixed":"f68671b1a98d426c57864bd457c125fee14ac1a5"},{"fixed":"2bdbe00454200fcb0110f31eeca8d906a3515e74"},{"fixed":"31a89af4f513d750fec196e2bb6195a7d4473e9f"},{"fixed":"1b5aacd5b2419b0790e955e466d389a61c79b4b1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.188"},{"fixed":"5.10.270"}]}],"versions":["v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.10.222","v5.10.221","v5.10.220","v5.10.219","v5.10.218","v5.10.217","v5.10.216","v5.10.215","v5.10.214","v5.10.213","v5.10.212","v5.10.211","v5.10.210","v5.10.209","v5.10.208","v5.10.207","v5.10.206","v5.10.205","v5.10.204","v5.10.203","v5.10.202","v5.10.201","v5.10.200","v5.10.199","v5.10.198","v5.10.197","v5.10.196","v5.10.195","v5.10.194","v5.10.193","v5.10.192","v5.10.191","v5.10.190","v5.10.189","v5.10.188"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90157.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90157.json"}}],"schema_version":"1.9.0"}